# Copyright (c) 2018 TU Dresden
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#
# Authors: Robert Scheffel

TARGET=bare_metal

SRC=$(wildcard *.c)
ASM=$(wildcard *.S)
OBJ=$(ASM:.S=.o) $(SRC:.c=.o)

CC=riscv64-unknown-elf-gcc
AS=riscv64-unknown-elf-as

ASMFLAGS=-march=rv64gc
CFLAGS=-std=c99 -O0 -Wall -Werror
LDFLAGS=-T link.ld

PREFIX=../../bin/riscv

all : pre-build $(TARGET)

pre-build :
	-mkdir -p $(PREFIX)

$(TARGET) : $(OBJ)
	$(CC) $(LDFLAGS) $^ -o $(PREFIX)/$@

%.o : %.S
	$(AS) $(ASMFLAGS) $< -o $@

%.o : %.c
	$(CC) -c $(CFLAGS) $< -o $@

.PHONY: clean clean_objects
clean:
	$(RM) -rf $(PREFIX) $(OBJ)

clean_objects:
	$(RM) -rf $(OBJ)
